The diagram shown here represents a portion of a nucleic acid molecule. The part indicated by the arrow could be

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

you should wear a lead protective shield when having teeth x-rays

hope i

-lavira : )